A cooling system and method for a receiving end of laser wireless energy transmission
By using cross-arranged spherical pits or convex hull structures on photovoltaic cells, disturbing the cold air flow and destroying the thermal boundary layer, the problem of poor cooling effect of drone photovoltaic cells is solved, and high efficiency and low resistance are achieved Cooling reduces temperature and volume, and improves battery power and battery life.
Patent Information
- Application Number
- CN202411239893.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2044-09-05
AI Technical Summary
The existing photovoltaic cell cooling system has the problem that the cooling effect and volume size conflict with the size of the volume on the drone. The natural circulation cooling effect is not obvious, while forced circulation cooling consumes additional energy and has a large volume and weight, which affects the battery life and aerodynamic performance.
The heat dissipation plate with a cross-arranged spherical pit or convex hull structure disturbs the cold air flow through the pit or convex hull, destroys the thermal boundary layer, increases the contact area between the air flow and the surface, achieves uniform convection heat exchange and reduces thermal resistance.
It achieves efficient cooling, reduces the temperature of the photovoltaic cell, increases the battery power, saves energy, reduces the probability of failure, and is small in size and light in weight, without additional energy consumption.
Smart Images
Figure CN118763989B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a cooling system and method for a receiving end of laser wireless energy transmission. Background Art
[0002] Laser wireless energy transmission is a way of transmitting energy using laser as a carrier. Its basic working principle is: the laser emits a high-energy laser with Gaussian distribution, which is irradiated onto the photovoltaic cell as the energy receiving end after tracking and calibration. The photovoltaic cell performs photoelectric conversion and converts the energy contained in the laser into electrical energy for the target method to work. It has great potential for application in wireless power transmission of unmanned aerial vehicles. During the operation of the photovoltaic cell, a large part of the energy of the absorbed laser is converted into heat energy in addition to being converted into electrical energy, which causes the temperature of the photovoltaic panel to rise. In addition, since the energy transmission carrier laser has an uneven Gaussian distribution, the temperature distribution of the photovoltaic panel at the receiving end will also be uneven. Excessive battery temperature and uneven temperature distribution will not only have a negative impact on the power generation conversion efficiency, but may also increase the aging speed of the battery panel or even cause overheating and damage. In order to improve the photoelectric conversion efficiency of the receiving end of laser wireless energy transmission and extend its service life, a suitable cooling system is needed to cool the photovoltaic cell.
[0003] At present, the commonly used photovoltaic cell cooling methods are natural circulation cooling and forced circulation cooling. Natural circulation cooling is to add a copper or aluminum heat dissipation plate on the back of the photovoltaic cell. You can also add heat dissipation structures such as fins and pin ribs. Use natural convection to pass cold air through the back of the battery to take away the heat to achieve the purpose of heat dissipation. Forced circulation cooling is to add channels and driving methods (such as fans or water pumps) on the back of the photovoltaic cell, use air or water as the cooling medium, and use the forced flow circulation of the cooling medium to take away the heat from the battery. The disadvantage of forced circulation cooling is that it requires additional energy consumption and also requires additional driving methods to drive forced convection. The volume and weight of the driving method are usually larger, and the increase in flow rate will also be accompanied by an increase in the power consumption of the driving method, and the overall efficiency of the system will be reduced. Compared with forced circulation cooling, natural circulation cooling does not require additional energy consumption.
[0004] However, the problems with natural circulation cooling are: the cooling effect of a radiator equipped with a single heat dissipation plate on the battery is not obvious and uniform, and the effect on improving the battery power is not significant; and the radiator with complex heat dissipation structures such as fins has a large volume, weight, and resistance. If it is installed on mobile devices such as drones, it will not only reduce its battery life, but may also affect its aerodynamic performance. Summary of the invention
[0005] Based on this, in order to solve the technical problem that the cooling effect and the volume size of the cooling method used for drones in the prior art conflict with each other, the present invention provides a cooling system and method for a laser wireless energy transmission receiving end.
[0006] The present invention provides a cooling system for a laser wireless energy transmission receiving end, comprising a laser wireless energy transmission receiving end carried on an unmanned aerial vehicle and a heat sink connected to the back of the laser wireless energy transmission receiving end, the heat sink is made of copper or aluminum, and the laser wireless energy transmission receiving end is a photovoltaic cell.
[0007] A heat sink composed of a plurality of pits or convex hulls is provided on one side of the heat sink away from the receiving end of the laser wireless energy transmission; the heat sink composed of the pits or convex hulls is spherical with a height-to-diameter ratio in the range of [0.1-0.3]; the heat sinks are distributed on the surface of the heat sink in a cross arrangement; the cross arrangement refers to the equal gap arrangement of the heat sinks in the same row, the center points of the heat sinks in the same row are located at the midpoints of the gaps between the heat sinks in the adjacent rows, and the center points of the heat sinks in the same column are located at the midpoints of the gaps between the heat sinks in the adjacent columns; the cross arrangement includes: the odd-numbered rows of the heat sink are heat sinks composed of convex hulls, and the even-numbered rows are heat sinks composed of pits; the odd-numbered rows of the heat sink are heat sinks composed of pits, and the even-numbered rows are heat sinks composed of convex hulls; the odd-numbered rows and even-numbered rows of the heat sink are all heat sinks composed of pits; the odd-numbered rows and even-numbered rows of the heat sink are all heat sinks composed of convex hulls.
[0008] The heat sink block is set as a pit or a convex hull to increase the contact area between the cold air flow and the surface of the heat sink; it is also used to disturb the cold air flow flowing through the heat sink to destroy the thermal boundary layer on the wall of the heat sink:
[0009] When the pit disturbs the cold air flow passing through the heat sink: when the UAV is flying, a cold air flow flows through the heat sink wall in the opposite direction of the UAV's flight direction. After flowing through the leeward side of the pit, the cold air flow washes the windward side of the pit along the heat sink wall, generating a vortex that disturbs the cold air flow.
[0010] When the convex hull disturbs the cold air flow passing through the heat sink: when the UAV is flying, a cold air flow flows through the wall of the heat sink in the opposite direction of the UAV's flight direction. After passing the top of the convex hull, the cold air flow flows along the wall of the heat sink toward the bottom of the convex hull, generating a vortex at the bottom of the downstream of the convex hull that disturbs the cold air flow.
[0011] The present invention provides a cooling method for a cooling system of a laser wireless energy transmission receiving end, comprising:
[0012] The cold air flow passed by the drone passes through the gaps between the heat sinks in the previous row and then passes through the heat sinks in the next row to reduce its speed. The speed of the cold air flow is controlled to change evenly when passing through the heat sinks, so that uniform convection heat exchange is performed with the heat sink.
[0013] The cold air flow from the drone passes through the leeward side of the pit and then flushes the windward side of the pit along the wall of the heat sink to generate a vortex. The cold air flow is disturbed to destroy the thermal boundary layer on the wall of the heat sink, thereby reducing thermal resistance.
[0014] The cold air flow passed by the UAV passes through the top of the convex hull and then flows along the heat sink wall toward the bottom of the convex hull to form a vortex at the bottom of the convex hull. By disturbing the cold air flow, the thermal boundary layer on the heat sink wall is destroyed, thereby reducing thermal resistance.
[0015] At least one of the above technical solutions can achieve the following beneficial effects:
[0016] The present invention provides a heat sink on the back of the laser wireless energy transmission receiving end carried on the unmanned aerial vehicle. The heat sink improves the cooling effect of the laser wireless energy transmission receiving end through cross-arranged pits or convex hulls. Specifically, when the unmanned aerial vehicle flies, the wall of the heat sink flows through the cold air flow in the opposite direction of the flight direction of the unmanned aerial vehicle. When the cold air flow flows through the wall of the heat sink, the speed of the cold air flow is uniformly changed by controlling the gap between the adjacent rows of heat sink blocks on the heat sink, so as to complete uniform convection heat exchange. The heat sink block is a pit or a convex hull, which can ensure that when the cold air flow flows through, after the leeward side of the pit, along the heat sink wall, the windward side of the pit is washed to generate a vortex to disturb the cold air flow, and after the top of the convex hull, along the heat sink wall to the bottom of the convex hull, a vortex is formed at the bottom of the convex hull to disturb the cold air flow, destroying the thermal boundary layer located on the wall of the cooling system, so that the thermal resistance is reduced and the heat exchange effect is enhanced; in addition, the pit or convex hull structure helps to increase the contact area between the airflow and the surface structure of the heat sink, so that the heat exchange is more sufficient, and the corresponding working temperature of the laser wireless energy transmission receiving end can also be reduced to a lower level.
[0017] In addition, the cooling system of the present invention minimizes the volume and weight of the overall method while ensuring the cooling effect, and does not require a driving method or additional energy consumption. When mounted on a drone, only flowing cold air is needed to achieve effective cooling of the laser wireless energy transmission receiving end, which not only saves energy to a great extent, but also reduces the probability of failure due to the lack of moving parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:
[0019] Figure 1 It is a side view of a cooling system for a receiving end of laser wireless energy transmission provided by the present invention;
[0020] Figure 2 It is a schematic diagram of the cross arrangement provided by the present invention;
[0021] Figure 3 is a cross-sectional view of a spherical pit provided by the present invention;
[0022] Figure 4 is a cross-sectional view of a spherical convex hull provided by the present invention;
[0023] Figure 5 The present invention provides a schematic diagram of the arrangement;
[0024] Figure 6 It is a schematic diagram of a cross row provided by the present invention;
[0025] Figure 7 It is a route map of the airflow through the arrangement provided by the present invention;
[0026] Figure 8 It is a route map of the airflow passing through the cross row provided by the present invention;
[0027] Fig. 9 The temperature distribution on the back side of the photovoltaic cell without cooling system provided by the present invention;
[0028] Fig.10 The temperature distribution on the back side of the photovoltaic cell with the added cooling system provided by the present invention;
[0029] Fig.11 It is the PV curve of the photovoltaic cell under different air flow rates provided by the present invention, the abscissa is the voltage U, the unit is volt V, and the ordinate is the photovoltaic cell power P, the unit is watt W.
[0030] Reference numerals:
[0031] 1- Photovoltaic cell; 2- Heat sink. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solution and advantages clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] Figure 1A side view of a cooling system for a receiving end of laser wireless energy transmission provided in this embodiment is shown, the cooling system comprising a photovoltaic cell 1 and a heat sink 2, the photovoltaic cell 1 being mounted on a drone as a receiving end of laser wireless energy transmission. The heat sink 2 is made of copper or aluminum, and has the same shape and size as the photovoltaic cell 1, and the thickness depends on actual needs. One side of the heat sink 2 is smooth, and is bonded to the back side of the photovoltaic cell 1 (i.e., the side that does not receive the laser) with a thermally conductive epoxy resin glue (or other adhesives that are resistant to high temperatures and have good thermal conductivity). The other side of the heat sink 2, i.e., the side away from the photovoltaic cell 1, is provided with a heat sink block composed of a number of pits or convex humps, and the heat sink blocks are distributed on the surface of the heat sink 2 in a cross arrangement. The cross arrangement refers to the arrangement of equal gaps between heat sink blocks in the same row, the center point of the heat sink block in the same row is located at the midpoint of the gap between the heat sink blocks in the adjacent row, and the center point of the heat sink block in the same column is located at the midpoint of the gap between the heat sink blocks in the adjacent column. Figure 2 A schematic diagram of a cross arrangement provided in this embodiment is shown. Based on the cross arrangement, the odd-numbered rows of the heat sink 2 are heat sinks composed of convex hulls, and the even-numbered rows are heat sinks composed of pits; the odd-numbered rows may be heat sinks composed of pits, and the even-numbered rows may be heat sinks composed of convex hulls; or both the odd-numbered rows and the even-numbered rows may be heat sinks composed of pits (convex hulls).
[0034] Figure 3 is a cross-sectional view of a spherical pit. Figure 4 It is a cross-sectional view of a spherical convex hull. Since spherical pits (or convex hulls) are cross-arranged on one side of the heat sink 2, the pits (convex hulls) in the even-numbered rows are separated by half a transverse pitch relative to the pits (convex hulls) in the odd-numbered rows in the airflow direction, which can better disturb the fluid and enhance heat exchange. The ratio of the height of the pit (convex hull) to its diameter can be [0.1-0.3] as needed. The larger the height-to-diameter ratio, the better the cooling effect, but the resistance increases accordingly, and the pits (convex hulls) can increase the contact area between the cold air flow and the surface of the heat sink 2.
[0035] Figure 5 This is a sequential diagram. Figure 6 It is a schematic diagram of a cross row; Figure 7 It is the route map of the airflow. Figure 8It is a route map of the airflow passing through the forked row. The reason why the pits or convex hulls on the surface of the heat sink 2 are arranged in a forked row is that in the airflow direction, the pits (convex hulls) in the even-numbered rows are separated by half a lateral pitch relative to the pits (convex hulls) in the odd-numbered rows. If the straight-line method is adopted, the air flowing through the gap between the two rows of pits (convex hulls) will hardly be disturbed, while the downstream of the pits (convex hulls) will generate resistance due to the airflow passing through the pits (convex hulls) many times, which further causes the airflow velocity between the pits (convex hulls) in the same row to be significantly lower than the airflow velocity between the two rows of pits (convex hulls), which has a negative impact on the heat exchange between the pits (convex hulls) in the same row. Therefore, the straight-line method will cause uneven temperature and airflow velocity in the direction perpendicular to the airflow. Compared with the straight row, the cross-row arrangement will immediately pass through the pits (convex hulls) of the next row after the airflow passes through the gaps between the pits (convex hulls) of the first row. In this way, the airflow flowing from upstream to downstream must pass through the disturbance of the pits (convex hulls), and the area of contact between the airflow and the surface structure of the heat sink 2 is larger, and the heat exchange is more sufficient; in addition, since the gas in the direction perpendicular to the airflow is subject to a similar degree of disturbance, its temperature and airflow velocity distribution are also more uniform.
[0036] When the cold air flow of the drone passes through the heat sink 2, the concave (convex) heat sink controls the uniform change of the cold air flow speed by reducing the cold air flow speed flowing through the gaps between adjacent rows of heat sink blocks, thereby performing uniform convection heat exchange with the heat sink 2.
[0037] The principle of heat transfer enhancement by pits and convex hulls: When the airflow flows over the surface of the pit, the pit sinks and the boundary layer of the wall separates, resulting in lower pressure on the leeward side of the pit, causing gas backflow. The gas at the rear of the pit then adheres to the wall and washes the windward side, generating complex small-scale vortices, enhancing fluid disturbance and heat transfer. The windward side is the side of the pit facing the wind, that is, the side where the airflow contacts the pit. On this side, the airflow flows through the pit, which may cause acceleration or other changes in the airflow. The leeward side is the side of the pit that is not facing the wind, that is, the side where the airflow passes behind the pit. On the leeward side, the airflow may experience an area of lower pressure, which may cause backflow or other airflow phenomena.
[0038] The windward side of the convex hull is washed by the incoming flow, the airflow velocity and pressure are high, the heat exchange is enhanced, the airflow begins to separate after reaching the top of the convex hull, and even produces backflow, and a vortex is formed at the bottom downstream of the convex hull, which enhances the disturbance of the fluid and strengthens the heat transfer.
[0039] The key technical point of the cooling system is: combining the photovoltaic cell 1 at the receiving end of the laser wireless energy transmission with the heat sink 2, and arranging the spherical pits and convex hull array on the surface of the heat sink 2 in a certain way, which can significantly reduce the battery temperature and improve the battery operating power under the premise of causing less flow resistance. When the drone equipped with this system is working, the upper photovoltaic panel receives the energy transmitted by the laser irradiation and converts it into electrical energy, and the lower heat sink 2 passes through a certain speed of cold air due to the flight of the drone. The pits or convex hull array on the surface of the lower heat sink 2 will disturb the airflow, and the boundary layer flowing close to the wall will detach from the wall. Since the thermal resistance of convective heat transfer is mainly concentrated in the thermal boundary layer, the surface structure of the heat sink 2 disturbs the fluid, and after destroying this layer of thermal boundary layer, the thermal resistance will be significantly reduced, the heat transfer effect will also be enhanced, and the corresponding working temperature of the photovoltaic cell 1 can also be reduced to a lower level. In addition, since the geometric shape of the spherical pits or convex hulls is regular and the size is small, the resistance to the air is also small, and the speed of the air will not be lost much when it flows through the heat sink 2, thus avoiding the uneven problem of strong upstream heat transfer and poor downstream heat transfer effect in traditional heat dissipation methods.
[0040] The purpose of the cooling system provided in this embodiment is to solve the problem of excessive temperature of the photovoltaic cell at the receiving end of laser wireless energy transmission during operation. In view of the shortcomings of the existing photovoltaic cell cooling technology, a high-efficiency low-resistance cooling system for the receiving end of laser wireless energy transmission is provided, which does not consume additional energy, has a simple structure, a small volume, a light weight, and a small resistance. Compared with uncooled photovoltaic cells, the photovoltaic cells equipped with the cooling system have a lower operating temperature and a higher peak power, which can effectively solve the problems of reduced photoelectric conversion efficiency and reduced service life of photovoltaic cells caused by excessively high operating temperatures. Compared with the heat dissipation plate of natural circulation cooling, the cooling system provided in this embodiment adds cross-arranged spherical pits or convex hull structures on the surface of the heat dissipation bottom plate. When the air flows through these structures, small vortices and separations are generated, which disturb the flow boundary layer, thereby destroying the thermal resistance layer of the boundary layer, expanding the low thermal resistance area, and significantly improving the heat transfer effect, which can more effectively reduce the temperature of the photovoltaic cell and increase the peak power of the cell. Compared with the natural circulation cooling system with fins and pin-fin structures, the cooling system provided in this embodiment has a simpler structure and requires less thermal conductive material, so the manufacturing cost can be significantly reduced. At the same time, the air encounters less resistance when flowing through the pits and convex humps, and the speed loss is also smaller. On the one hand, the cooling effect on the battery is more uniform, which is beneficial to the improvement of the photoelectric conversion efficiency of the photovoltaic cell 1; on the other hand, when it is carried on mobile devices such as drones, the lower resistance also has a positive effect on extending the battery life of the device. In addition, the simple structure is also easier to clean, eliminating the problem of dust accumulation on ordinary heat sink fins and affecting the heat dissipation effect. Compared with the forced circulation cooling system, the cooling system provided in this embodiment eliminates the driving method and additional energy consumption, and does not need to use other media. Only flowing cold air can achieve effective cooling of photovoltaic cells, which not only saves energy to a great extent, but also reduces the probability of failure due to the lack of moving parts.
[0041] This embodiment also provides an experiment to verify the cooling effect of the cooling system for the laser wireless energy transmission receiving end involved in this embodiment. Fig. 9 is the temperature distribution on the back side of the photovoltaic cell without cooling system; Fig.10 The temperature distribution on the back of the photovoltaic cell with the cooling system added. The average temperature of the laser wireless energy receiving end without the cooling system is 152°C during operation. After adding the cooling system, the average operating temperature is 30°C, which is significantly lower and the temperature distribution is more uniform. The maximum current and power of the battery equipped with the cooling system are significantly improved. The slower the current decreases with the increase of the external voltage, the higher the peak power and the voltage corresponding to the peak power. Fig.11It is the PV curve of photovoltaic cells under different air flow rates. The horizontal axis is the voltage U, in volts V, and the vertical axis is the photovoltaic cell 1 power P, in watts W. When the flow rate of the heat dissipation flow field is 10m / s, 20m / s, and 39m / s, the power peaks are 0.98W, 1.06W, and 1.12W, respectively, which are 15.3, 16.7, and 17.7 times higher than the battery power without a cooling system (0.06W).
[0042] The surface of the heat sink 2 can be all spherical pits, or all spherical convex hulls, or a row of pits separated by a row of convex hulls, which will cause stronger disturbance to the flow. The pits or convex hulls on the surface of the heat sink 2 are arranged in a staggered arrangement (the pits (convex hulls) in the even-numbered rows are separated by half a horizontal pitch from the pits (convex hulls) in the odd-numbered rows). If less resistance is required, a straight arrangement can also be used (the pits (convex hulls) in the even-numbered rows and the pits (convex hulls) in the odd-numbered rows are located on the same straight line in the vertical direction).
[0043] The cooling system for the laser wireless energy transmission receiving end provided by one or more embodiments above, based on the same idea, also provides a corresponding cooling method for the cooling system for the laser wireless energy transmission receiving end, including:
[0044] The cold air flow that the drone passes through passes through the gaps between the heat sinks in the previous row and then slows down after passing through the heat sinks in the next row. The speed of the cold air flow is controlled to change evenly when passing through the heat sinks, and uniform convection heat exchange is performed with the heat sink.
[0045] The cold air flow passed by the drone flows through the leeward side of the pit and then washes the windward side of the pit along the wall of the heat sink to generate a vortex. By disturbing the cold air flow, the thermal boundary layer on the wall of the heat sink is destroyed, thereby reducing thermal resistance.
[0046] The cold air flow passed by the UAV flows through the top of the convex hull and then flows along the wall of the heat sink toward the bottom of the convex hull, forming a vortex at the bottom of the downstream of the convex hull. By disturbing the cold air flow, the thermal boundary layer on the wall of the heat sink is destroyed, thereby reducing thermal resistance.
[0047] For the specific definition of the cooling method, please refer to the definition of the cooling system for the receiving end of laser wireless energy transmission mentioned above, which will not be repeated here. Each module in the above cooling method can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.
[0048] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the description.
Claims
1. A cooling system for a laser wireless energy transmission receiving end, comprising a laser wireless energy transmission receiving end mounted on an unmanned aerial vehicle and a heat sink connected to the back of the laser wireless energy transmission receiving end, characterized in that: One side of the heat sink is smooth and bonded to the side that does not receive the laser with thermally conductive epoxy resin glue; A heat dissipation block consisting of a plurality of pits or convex hulls is provided on one side of the heat dissipation plate away from the laser wireless energy transmission receiving end, and the heat dissipation blocks are distributed on the surface of the heat dissipation plate in a cross-arrangement manner; The concave pit or the convex hump is used to increase the contact area between the cold air flow and the surface of the heat sink; and is used to disturb the cold air flow passing through the heat sink to destroy the thermal boundary layer located on the wall surface of the heat sink; When the pit disturbs the cold air flow passing through the heat sink: when the UAV is flying, the cold air flow in the opposite direction of the UAV's flight direction flows through the wall of the heat sink, and the cold air flow flows through the leeward side of the pit and then flushes the windward side of the pit along the wall of the heat sink, generating a vortex that disturbs the cold air flow: When the convex hull disturbs the cold air flow passing through the heat sink: when the UAV is flying, the cold air flow in the opposite direction of the UAV's flight direction flows through the wall surface of the heat sink, and after the cold air flow passes through the top of the convex hull, it flows along the wall surface of the heat sink toward the bottom of the convex hull, and a vortex is generated at the bottom of the downstream of the convex hull to disturb the cold air flow; The heat sink formed by the concave pit or convex hull is spherical, and the ratio of the height to the diameter of the sphere is in the range of [0.1-0.3]; The cross arrangement refers to the arrangement of equal gaps between heat sinks in the same row, with the center points of the heat sinks in the same row located at the midpoints of the gaps between heat sinks in adjacent rows, and the center points of the heat sinks in the same column located at the midpoints of the gaps between heat sinks in adjacent columns; When the cold air flow of the drone passes through the heat sink, the heat sink controls the cold air flow speed to change evenly by reducing the cold air flow speed flowing through the gaps between adjacent rows of heat sinks, thereby performing uniform convection heat exchange with the heat sink.
2. The cooling system for the receiving end of laser wireless energy transmission according to claim 1, characterized in that: The odd-numbered rows of the heat sink are heat sink blocks formed by convex hulls, and the even-numbered rows are heat sink blocks formed by concave pits.
3. The cooling system for a laser wireless energy transmission receiving end according to claim 1, characterized in that: The odd-numbered rows of the heat sink are heat sink blocks formed by pits, and the even-numbered rows are heat sink blocks formed by convex hulls.
4. The cooling system for a laser wireless energy transmission receiving end according to claim 1, characterized in that: The odd-numbered rows and even-numbered rows of the heat sink are all heat sink blocks formed by pits.
5. The cooling system for a laser wireless energy transmission receiving end according to claim 1, characterized in that: The odd-numbered rows and even-numbered rows of the heat sink are all heat sink blocks formed by convex hulls.
6. The cooling system for a laser wireless energy transmission receiving end according to claim 1, characterized in that: The heat sink is made of copper or aluminum, and the laser wireless energy transmission receiving end is a photovoltaic cell.
7. A cooling method for a cooling system for a receiving end of laser wireless energy transmission according to any one of claims 1 to 6, characterized in that: include: The cold air flow that the drone flies through passes through the gaps between the heat sinks in the previous row and then passes through the heat sinks in the next row to slow down. The speed of the cold air flow is controlled to change evenly when passing through the heat sinks, so that uniform convection heat exchange is performed with the heat sink. The cold air flow that the drone flies through flows through the leeward side of the pit and then scours the windward side of the pit along the wall of the heat sink to generate a vortex. By disturbing the cold air flow, the thermal boundary layer on the wall of the heat sink is destroyed, thereby reducing thermal resistance. The cold air flow passed by the UAV flows through the top of the convex hull and then flows along the wall of the heat sink toward the bottom of the convex hull, forming a vortex at the bottom of the downstream of the convex hull. By disturbing the cold air flow, the thermal boundary layer on the wall of the heat sink is destroyed, thereby reducing thermal resistance.